A juggler keeps four balls in air. He throws each ball vertically upwards with the same speed at equal interval of time. The maximum height attained by each ball is 20m. Find kinetic energy of first ball when fourth ball is in hand. Assume that the mass of each ball is 10g. 0.5 J 1 J 1.5 J 2.5 J

Two balls are projected vertically upward with same speed 35 m/s in 3s interval. Find height at which both balls collide.

A ball is projected vertically up wards with a velocity of 100 m/s. Find the speed of the ball at half the maximum height. (g=10 m//s^(2))

A ball is thrown up at a speed of 4.0 m/s. Find the maximum height reached by the ball. Take g=10 m//s^2 .

A ball is thrown vertically upward with speed 10 m//s and it returns to the ground with speed 8 m//s . A constant air resistance acts. The minimum height attained by the ball is

A juggler throws balls into air. He throws one when ever the previous one is at its height point. If he throws n balls each second, the height to which each ball will rise is

A ball is throw vertically upward. It has a speed of 10 m//s when it has reached on half of its maximum height. How high does the ball rise ? (Taking g = 10 m//s^2 ).

Balls are thrown vertically upwards in such a way that the next ball is thorwn when the previous one is at the maximum height. If the maximum hieght is 5m , the number of balls thrown per minute will be

A ball thrown vertically upwards returns to the thrower in 20 second. Calculate the velocity with which it was thrown and the maximum height attained by the ball. Take g = 10 m//s^(2) .

(a) A ball is thrown vertically upward with speed 10 m//s and it returns to the ground with speed 8 m//s . Find the maximum height attained by the ball. (b) A ball is thrown vertically upward and if air resistance is half of weight of the ball, find the ratio of time of ascent and time of descent. (C) Two balls A and B (m_(A) = 2 m_(B) = 2 m) are thrown vertically upward. If air resistance is mg//2 , find ratio of maximum height attained by them.

A ball is thrown vertically upwards with a velocity u from the ground. The ball attains a maximum height H_("max") . Then find out the time and displacement at which ball have half of the maximum speed